A modular prefabricated water purification device and its application method

Abstract

The present invention discloses a modular prefabricated water purification device and its application method, including a modular micro-vortex clarification device. The modular micro-vortex clarification device includes a spliced cylinder body, which is mainly assembled and spliced by spliced wall plates, vertical rubber sealing strips, circumferential rubber sealing rings, vertical arc-shaped connecting plates, circumferential arc-shaped connecting plates, spliced wall plate connection holes, outer arc-shaped gaskets, inner arc-shaped gaskets, and connecting bolts. Z-shaped notches are provided on the four sides of the spliced wall plates. Vertical rubber sealing strips and circumferential rubber sealing rings are arranged between the spliced wall plates, making the high-turbidity water treatment process shorter, the device modular and miniaturized, with good water purification effect. Especially for small and medium-sized water treatment plants, the construction period is shorter, the civil engineering investment is reduced, the construction period is shortened, the problem that large-diameter tanks cannot be prefabricated and transported in the factory is solved, the operation cost is lower, which is beneficial to energy conservation, the plant construction period is shorter, and it is movable.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment equipment, and particularly relates to a modular micro-vortex clarification device, and especially to a modular assembled water purification device and its application method. Background Art

[0002] Water treatment refers to the physical and chemical measures taken to make the water quality reach a certain use standard. The minimum standard for drinking water is formulated by the environmental protection department. Industrial water has its own requirements. The physical properties of water, such as temperature, color, transparency, odor, and taste, are the basic criteria for judging the quality of water. The chemical properties of water, such as its acidity, the concentration of dissolved solids, and the oxygen content, are also important criteria for judging water quality. Such water, even if its physical properties meet the requirements, cannot be used casually. In addition, the content of radioactive elements from nature, nuclear accidents, nuclear power plants, etc. is also an important characteristic that must be monitored.

[0003] Existing water treatment for supply usually undergoes clarification and filtration processes. In particular, clarifiers generally adopt concrete structures, which are large in volume, have low clarification efficiency, long construction periods, high construction costs, long durations, and the construction environment is restricted by many factors. Once built, it is impossible to add process devices according to the actual water quality situation. Moreover, the turbidity of the clarifier effluent is 20 - 30 NTU, which is too large, resulting in an increased filtration load on the subsequent filter and an increased frequency of backwashing of the filter media, which is not conducive to energy conservation and environmental protection. Existing clarifiers often also have power stirring equipment, which requires providing stirring power and has a long clarification time. Therefore, it is very necessary to design and develop equipment with a small floor area, high efficiency, and easy modular on-site assembly on the basis of the existing technology. The equipment has good integrity, is convenient for transportation and movement, and is conducive to energy-saving and high-efficiency modular equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a modular assembled water purification device and its application method to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A modular prefabricated water purification device and its application method, including a modular micro-vortex clarification device. The modular micro-vortex clarification device includes a spliced cylinder body, which is mainly assembled and spliced by spliced wall panels, vertical rubber sealing strips, circumferential rubber sealing rings, vertical arc-shaped connecting plates, circumferential arc-shaped connecting plates, spliced wall panel connection holes, outer arc-shaped gaskets, inner arc-shaped gaskets, and connecting bolts. Z-shaped notches are provided on the four sides of the spliced wall panels. Vertical rubber sealing strips and circumferential rubber sealing rings are arranged between the spliced wall panels. The vertical rubber sealing strips are arranged in the Z-shaped notches on the left and right sides of the spliced wall panels, and the circumferential rubber sealing rings are arranged in the Z-shaped notches on the upper and lower sides of the spliced wall panels. An inner arc-shaped gasket is arranged on one side of the circumferential rubber sealing ring, and an outer arc-shaped gasket is arranged on the other side of the circumferential rubber sealing ring. A number of vertical arc-shaped connecting plates and circumferential arc-shaped connecting plates are arranged in the spliced cylinder body. A number of spliced wall panel connection holes are provided on the vertical arc-shaped connecting plates, circumferential arc-shaped connecting plates, and spliced wall panels. Connecting bolts are sleeved in the spliced wall panel connection holes, and the connecting bolts are threadedly connected with the spliced wall panel connection holes. The bottom of the spliced cylinder body is fixedly connected with a bottom conical cylinder body. A number of spliced channel steels are arranged in the spliced cylinder body. A number of spliced wall panel connection holes are provided on the spliced channel steels, and the spliced wall panel connection holes are threadedly connected with the connecting bolts. The spliced channel steels are connected with the spliced cylinder body through the connecting bolts. A swirl cone body is arranged in the spliced wall panel. The swirl cone body is a hollow cylinder in an inverted conical shape. An inclined tube support frame is sleeved outside the swirl cone body, and the inclined tube support frame is fixedly connected with the spliced channel steel. A number of inclined tubes are arranged on the surface of the inclined tube support frame. An inner cylinder body is sleeved outside the swirl cone body, and the inner cylinder body is arranged above the inclined tube support frame. The top of the inner cylinder body is fixedly connected with an upper cylinder support, and the upper cylinder support is fixedly connected with the spliced channel steel. The bottom of the swirl cone body is fixedly connected with a three-dimensional swirl tube, and the bottom end of the three-dimensional swirl tube is connected with a water inlet pipe through a flange. One end of the water inlet pipe penetrates through the bottom of the bottom conical cylinder body and is arranged outside the bottom conical cylinder body. A sewage discharge pipe is fixedly connected to the bottom of the bottom conical cylinder body. The sewage discharge pipe is fixedly connected to the bottom of the bottom conical cylinder body, and the sewage discharge pipe is communicated with the inner cavity of the spliced cylinder body. A clarified water outlet is fixedly connected to one side of the spliced cylinder body, and the clarified water outlet is communicated with the inner cavity of the spliced cylinder body. The clarified water outlet is fixedly connected with a connecting pipeline, and one end of the connecting pipeline is fixedly connected with a DA-D type filter tank.

[0007] As a further scheme of the present invention: A number of support legs are fixedly connected to the surface of the bottom conical cylinder body.

[0008] As a still further scheme of the present invention: A method for applying a modular prefabricated water purification device:

[0009] Step 1: Reagent preparation. Prepare a PAC solution with a concentration of 10% and a PAM solution with a concentration of 0.1%. The PAC needs to be mixed and stirred for 30 minutes before use. Since the dissolution ability of PAM is limited, it needs to be quickly stirred for 60 minutes before use, and stirred for 2 minutes every 30 minutes to prevent uneven reagent concentration.

[0010] Step 2: Raw water dosing. Add reagents to the raw water to be treated through a diaphragm pump. The turbidity of the raw water is between 900 NTU and 1100 NTU. The flocculant PAC (polyaluminum chloride) is dosed at a rate of 20 mg / L - 30 mg / L, and the coagulant aid PAM (polyacrylamide) is dosed at a rate of 0.2 mg / L - 0.3 mg / L.

[0011] Step 3: After the raw water and the reagents are fully mixed, they are sent through a pump and an inlet pipe into the micro-vortex clarifier in the modular water purification device.

[0012] Step 4: Suspended solid flocculation. The incoming water passes through the three-dimensional spiral inlet of the micro-vortex clarifier to change the random growth mode of the flocs. Due to the three-dimensional spiral guiding the water flow, the water flow forms an upward swirling flow and rotates upward along the cone. The flocs are affected by the centrifugal force F = mv^2 / r, and the particles spiral upward along the cylinder wall. The incoming water overflows along the center of the cylinder. At the same time, the particles are also affected by the shear force formed by gravity. The concentration of the suspended particles on the cylinder wall rises rapidly, accelerating the collision and shearing of the loose flocs to form spherical and dense flocs.

[0013] Step 5: Solid-liquid separation. The spherical and dense flocs overflow from the upper cylinder wall opening of the swirling cone in the micro-vortex clarifier, settle quickly, and fall into the bottom area. There are still some remaining fine particles in the clear water overflowing from the center of the cone. When the water flowing along the lower edge of the inner cylinder into the upper clarification area passes through the inclined tubes, the remaining fine particles are adsorbed on the surface of the inclined tubes. As the adsorption amount increases, the remaining fine particles fall off and form sludge, which directly slides into the bottom area through the diversion ditch. Sludge is discharged once every 6 hours of operation, and the sludge discharge time is 45 seconds.

[0014] Step 6: Clear water collection. The clear water after solid-liquid separation rises to the clear water collection area. The turbidity of the effluent can be effectively controlled below 5 NTU to 10 NTU. The clear water passes through the effluent outlet and enters the D-type filter through a pipeline.

[0015] Step 7: Clear water discharge. The clear water enters the D-type filter (DA-D type filter) equipped with the authorized patent (CN201020240530.0, a butterfly-shaped high-efficiency self-adjusting plastic fiber mixed filter element) for filtration treatment (a well-known technology). The turbidity of the effluent is between 0.4 NTU and 0.6 NTU, meeting the requirements of the turbidity of the effluent in the "Sanitary Standard for Drinking Water" (GB5749-2006). The effluent is drained to the clear water tank through the outlet pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The high-turbidity water treatment process is shorter, the device is modular and miniaturized, the water purification effect is good, especially for small and medium-sized water treatment plants, the construction period is shorter, the civil engineering investment is reduced, the construction period is shortened, the problem that large-diameter tanks cannot be prefabricated and transported in the factory is solved, the operation cost is lower, which is beneficial to energy conservation, the plant construction period is shorter, it is movable, which is beneficial to solving the problems of long construction period and high operation cost of rural water supply stations, and is more beneficial to the drinking water health of township residents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a modular assembled water purification device.

[0019] Figure 2 It is an application process flow chart of a modular assembled water purification device and its application method.

[0020] Figure 3 It is a front view of a modular assembled water purification device.

[0021] Figure 4 It is a three-dimensional view of a modular assembled water purification device.

[0022] Figure 5 It is a top view of a modular assembled water purification device.

[0023] Figure 6 It is Figure 1 an enlarged schematic structural diagram of part A in

[0024] Figure 7 It is a cross-sectional view of an annular sealing ring of a modular assembled water purification device.

[0025] Figure 8 It is a schematic structural diagram of a circumferential arc-shaped connecting plate of a modular assembled water purification device.

[0026] Figure 9 It is a schematic structural diagram of a splicing channel steel of a modular assembled water purification device.

[0027] Figure 10 It is a top view of a three-dimensional swirl tube of a modular assembled water purification device.

[0028] Figure 11 It is a side view of a three-dimensional swirl tube of a modular assembled water purification device.

[0029] Figure 12 It is a three-dimensional view of a three-dimensional swirl tube of a modular assembled water purification device.

[0030] Figure 13The front view of the splicing wall panel of a modular prefabricated water purification device.

[0031] Figure 14 The sectional view of the splicing wall panel of a modular prefabricated water purification device.

[0032] Figure 15 The structural schematic diagram of the splicing wall panel of a modular prefabricated water purification device.

[0033] Figure 16 is Figure 14 The enlarged structural schematic diagram at position B in

[0034] Figure 17 The experimental data chart [Table 3] of the present invention.

[0035] Figure 18 The experimental data chart [Table 4] of the present invention.

[0036] As shown in the figure: modular micro-vortex clarification device 1, connecting pipeline 2, D-type filter tank 3, splicing wall panel 101, vertical rubber sealing strip 102, circumferential rubber sealing ring 103, vertical arc-shaped connecting plate 104, circumferential arc-shaped connecting plate 105, splicing wall panel connection hole 106, outer arc-shaped gasket 107, inner arc-shaped gasket 108, connecting bolt 109, splicing channel steel 110, inner cylinder 111, upper support of the cylinder 112, inclined tube 113, inclined tube support frame 114, bottom conical cylinder 115, water inlet pipe 116, three-dimensional swirl tube 117, swirl cone 118, support leg 119, sewage discharge pipe 120, clarified water outlet 121, spiral guide pipe 122. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1 - 16, in the embodiments of the present invention, a modular prefabricated water purification device includes a modular micro-vortex clarification device 1, a connecting pipeline 2, and a DA-D type filter tank 3. The modular micro-vortex clarification device 1 includes a splicing cylinder 11, and the splicing cylinder 11 is mainly assembled by a 101 splicing wall panel, a 102 vertical rubber sealing strip, a 103 circumferential rubber sealing ring, a 104 vertical arc-shaped connecting plate, a 105 circumferential arc-shaped connecting plate, a 106 splicing wall panel connection hole, a 107 outer arc-shaped gasket, a 108 inner arc-shaped gasket, and a 109 connecting bolt. Z-shaped notches are provided on all four sides of the splicing wall panel 101. A vertical rubber sealing strip 102 and a circumferential rubber sealing ring 103 are arranged between the splicing wall panels 101. The vertical rubber sealing strip 102 is arranged in the Z-shaped notches on the left and right sides of the splicing wall panel 101, and the circumferential rubber sealing ring 103 is arranged in the Z-shaped notches on the upper and lower sides of the splicing wall panel 101. An inner arc-shaped gasket 108 is arranged on one side of the circumferential rubber sealing ring 103, and an outer arc-shaped gasket 107 is arranged on the other side of the circumferential rubber sealing ring 103. A plurality of vertical arc-shaped connecting plates 104 and circumferential arc-shaped connecting plates 105 are arranged in the splicing cylinder 11. A plurality of splicing wall panel connection holes 106 are provided on the vertical arc-shaped connecting plate 104, the circumferential arc-shaped connecting plate 105, and the splicing wall panel 101. A connecting bolt 109 is sleeved in the splicing wall panel connection hole 106, and the connecting bolt 109 is threadedly connected to the splicing wall panel connection hole 106. The bottom of the splicing cylinder 11 is fixedly connected to a bottom conical cylinder 115. A plurality of splicing channel steels 110 are arranged in the splicing cylinder 11. A plurality of splicing wall panel connection holes 106 are provided on the splicing channel steel 110, and the splicing wall panel connection hole 106 is threadedly connected to the connecting bolt 109. The splicing channel steel 110 is connected to the splicing cylinder 11 through the connecting bolt 109. A swirl cone 118 is arranged in the splicing wall panel 101. The swirl cone 118 is an inverted conical hollow cylinder. An inclined tube support frame 114 is sleeved outside the swirl cone 118, and the inclined tube support frame 114 is fixedly connected to the splicing channel steel 110. A plurality of inclined tubes 113 are arranged on the surface of the inclined tube support frame 114. An inner cylinder 111 is sleeved outside the swirl cone 118, and the inner cylinder 111 is arranged above the inclined tube support frame 114. The top end of the inner cylinder 111 is fixedly connected to a cylinder upper support 112, and the cylinder upper support 112 is fixedly connected to the splicing channel steel 110. The bottom of the swirl cone 118 is fixedly connected to a three-dimensional swirl tube 117. The bottom end of the three-dimensional swirl tube 117 is connected to a water inlet pipe 116 through a flange. One end of the water inlet pipe 116 penetrates through the bottom of the bottom conical cylinder 115 and is arranged outside the bottom conical cylinder 115. A sewage discharge pipe 120 is fixedly connected to the bottom of the bottom conical cylinder 115. The sewage discharge pipe 120 is fixedly connected to the bottom of the bottom conical cylinder 115, and the sewage discharge pipe 120 is communicated with the inner cavity of the splicing cylinder 11. A clarified water outlet 121 is fixedly connected to one side of the splicing cylinder 11. The clarified water outlet 121 is communicated with the inner cavity of the splicing cylinder 11. The clarified water outlet 121 is fixedly connected to a connecting pipeline 2,One end of the connecting pipeline 2 is fixedly connected to a DA-D type filter tank 3, and a number of supporting legs 119 are fixedly connected to the surface of the bottom conical cylinder 115.,

[0039] A method for applying a modular assembled water purification device:

[0040] Example:

[0041] Step 1: Chemical dosing. Prepare PAC solution with a concentration of 10% and PAM solution with a concentration of 0.1%. The PAC needs to be mixed and stirred for 30 minutes before use; since the dissolution ability of PAM is limited, it needs to be rapidly stirred for 60 minutes before use, and stirred for 2 minutes every 30 minutes to prevent uneven chemical concentration;

[0042] Step 2: Raw water dosing. Add chemicals to the raw water to be treated through a diaphragm pump. The turbidity of the raw water is between 900 NTU and 1100 NTU. The flocculant PAC (poly aluminum chloride) is added at a dosage of 20 mg / L - 30 mg / L, and the coagulant aid PAM (polyacrylamide) is added at a dosage of 0.2 mg / L - 0.3 mg / L;

[0043] Step 3: After the raw water and the chemicals are fully mixed, they are pumped through the water inlet pipe 116 into the micro-vortex clarifier (swirl cone 118) in the modular water purification device;

[0044] Step 4: Suspended solid flocculation. The influent passes through the three-dimensional spiral water inlet of the micro-vortex clarifier to change the random growth mode of the flocs. Due to the three-dimensional spiral guiding the water flow, the water flow forms an upward swirling flow and rotates upward along the cone. The flocs are affected by the centrifugal force F = mv^2 / r, and the particles spiral upward along the cylinder wall. The influent overflows along the center of the cylinder. At the same time, the particles are also affected by the shear force formed by gravity. The concentration of suspended particles on the cylinder wall rises rapidly, accelerating the collision and shearing of the loose flocs to form spherical and dense flocs;

[0045] Step 5: Solid-liquid separation. The spherical and dense flocs overflow from the upper cylinder wall opening of the swirl cone in the micro-vortex clarifier, settle rapidly, and fall into the bottom area. There are still some remaining fine particles in the clear water overflowing from the center of the cone. When the water flow along the lower edge of the inner cylinder enters the upper clarification area (the cylindrical space area between the clear water outlet 121 and the inner cylinder 111 and close to the clear water outlet 121 at the uppermost part of the spliced cylinder 11) passes through the inclined tube, the remaining fine particles are adsorbed on the surface of the inclined tube. As the adsorption amount increases, the remaining fine particles fall off and form sludge, which directly slides into the bottom area through the diversion ditch. Sludge is discharged once every 6 hours of operation, and the sludge discharge time is 45 seconds;

[0046] Step 6: Clarified water collection. The clarified water after solid-liquid separation rises to the clarified water collection area (a cylindrical space area at the uppermost part within the spliced cylinder 11, between the clarified water outlet 121 and the inner cylinder 111, near the clarified water outlet 121). The turbidity of the effluent can be effectively controlled below 5 NTU to 10 NTU. It enters the D-type filter through the pipeline via the clarified water outlet.

[0047] Step 7: Clear water discharge. The clarified water enters the D-type filter (produced by Tsinghua University and Xinjiang De'an Environmental Protection Co., Ltd.) equipped with an authorized patent butterfly-shaped highly efficient self-adjusting plastic fiber mixed filter medium (patent number CN201020240530.0) for filtration treatment (a well-known filtration technology). The turbidity of the effluent is between 0.4 NTU and 0.6 NTU, meeting the requirements for the turbidity of the effluent in the "Sanitary Standard for Drinking Water" (GB5749 - 2006). The effluent is drained to the clear water tank through the outlet pipe.

[0048] Experiment description: The turbidity of the raw water is between 900 NTU and 1100 NTU. The flocculant PAC (poly aluminum chloride) is added with a dosage of 20 mg / L, and the coagulant aid PAM (polyacrylamide) is added with a dosage of 0.2 mg / L. The data collection time interval is 30 minutes. The data is shown in Table 1, Table 2, Figure 17 [Table 3], Figure 18 [Table 4] as follows:

[0049] Inlet turbidity * 100 9.4 9.33 9.44 9.55 9.65 9.75 9.85 9.95 10.03 10.1 10.1 10.15 10.2 10.15 Effluent turbidity of the micro - vortex clarifier 7.214 6.254 6.037 5.592 5.714 6.488 7.408 7.69 7.615 7.515 7.241 8.052 8.924 9.982 Effluent turbidity of the D - type filter 0.512 0.505 0.495 0.485 0.491 0.503 0.515 0.512 0.513 0.525 0.52 0.531 0.561 0.612 Time period in minutes 0 30 60 90 120 150 180 210 240 270 300 330 360 390

[0050] Inlet turbidity * 100 10.2 10.4 10.3 10.4 10.4 10.48 10.5 10.65 10.6 10.6 10.5 10.5 10.55 10.6 Effluent turbidity of the micro - vortex clarifier 8.28 7.527 6.811 7.447 7.464 6.357 6.313 5.847 5.657 6.027 7.846 8.096 9.051 10 Effluent turbidity of the D - type filter 0.625 0.535 0.524 0.534 0.546 0.526 0.521 0.508 0.495 0.507 0.521 0.535 0.582 0.596 Time period in minutes 420 450 480 510 540 570 600 630 660 690 720 750 780 810

[0051] For this invention, the blowdown valve of the micro-vortex clarifier needs to be opened in time for 45 s every 6 hours of operation. From the experimental data, it can be seen that after the equipment operates for 6 hours, the turbidity of the clarified water outlet will approach 10 NTU. After the blowdown valve is opened, the equipment continues to operate normally. The overall operation of the equipment is good, and the turbidity of the effluent can be controlled between 0.485 NTU and 0.625 NTU, far less than the national standard of 1 NTU. The product meets the design requirements.

[0052] The working principle of this invention is:

[0053] The raw water added with PAM agent is pumped from the bottom of the bottom conical cylinder 115 upwards through the water inlet pipe 116 and the spiral guide pipe 122 of the device in sequence to the three-dimensional swirl pipe 117. The agent has a flocculation effect, accelerating the flocculation of suspended solids. However, the flocs grow in a random pattern, are relatively loose, have a relatively low density, and the sedimentation time is too long, affecting the equipment volume and the water purification effect. The device changes the random growth pattern of the flocs through the three-dimensional swirl pipe 117. Since the spiral guide pipes 122 are fixedly arranged on the outer peripheral surface of the three-dimensional swirl pipe 117, the spiral guide pipes 122 are all three-dimensional spiral water inlets extending along the positive helix direction around the three-dimensional swirl pipe 117. At least two spiral guide pipes 122 are provided. The lower end ports of the spiral guide pipes 122 are externally located outside the three-dimensional swirl pipe 117 and communicate with the water inlet pipe 116. The upper end ports of the spiral guide pipes 122 pass through the circumferential wall of the three-dimensional swirl pipe 117 along the spiral direction and extend into the three-dimensional swirl pipe 117 to communicate with the three-dimensional swirl pipe 117. The spiral guide pipes 122 are arranged and extended along the positive helix direction on the positive helix, and the positive helices where they are located do not coincide, but the radius and pitch are equal. When the raw water flows upwards through the spiral guide pipes 122, the spiral guide pipes 122 cause the raw water flow to form a swirl flowing upwards along the positive spiral line in the spiral guide pipes 122, guiding the raw water flow to enter a tangential spiral upward movement to increase its tangential velocity, avoid forming a turbulent flow and causing power loss, and form sufficient centrifugal force, so that the ultra-fine solid particles in the raw water are distributed along the wall of the swirl cone 118 and spiral upwards, rotating upwards along the swirl cone 118. The flocs are affected by the centrifugal force F = mv^2 / r. The ultra-fine solid particles spiral upwards along the wall, gradually forming low-density flocculent particles or irregular particles. The inlet water overflows along the center of the cylinder. At the same time, the particles are also affected by the shear force formed by the gravity. The concentration of the suspended particles on the wall rises rapidly, accelerating the collision and shear of the loose flocs, forming high-density, approximately spherical or spherical dense flocs, overflowing along the wall, quickly settling, and falling into the bottom area. There are still some remaining fine particles in the clear water overflowing from the center of the cone, entering the upper clarification area along the lower edge of the inner cylinder. The fine suspended particles fall into the inclined pipes 113. The inclined pipes 113 are fixedly arranged around the swirl cone 118 and are symmetrically inclined relative to the swirl cone 118. The inclined pipes 113 are in a straight-line segment shape and are fixedly connected seamlessly adjacent to each other. The angles of the inclined pipes 113 relative to the horizontal plane are equal. The distance between the upper end pipe orifice of the inclined pipe 113 and the central axis of the swirl cone 118 is greater than the distance between the lower end pipe orifice of the inclined pipe 113 and the central axis of the swirl cone 118. The inclined pipes 113 play a role in accelerating the sedimentation of fine suspended particles, directly sliding into the bottom area (the bottom conical cylinder 115). Due to the addition of the distance between the inclined pipes 113 and the swirl cone 118, the remaining fine particles can settle quickly, greatly reducing the residence time of the remaining fine particles, avoiding the influence of the remaining fine particles on the effluent, effectively reducing the equipment volume, and improving the water purification effect. After gravity sedimentation treatment,The effluent turbidity can be effectively controlled below 10 NTU. The effluent filtered to a turbidity below 10 NTU is discharged from the clarified water outlet 121 and enters the DA-D type filter for further filtration. Meanwhile, the sludge formed by the accumulation of particles that slide into the bottom conical cylinder 115 is discharged through the sewage pipe 120 under the action of gravity.

[0054] Traditional clarifiers are made of enamel steel plates spliced together, especially for large-diameter tanks that are not suitable for factory processing and transportation. However, the sealing performance of the spliced cylinder is poor. Our enamel spliced steel plates are treated with Z-shaped notches and sealed with Z-shaped rubber gaskets. Through the gravity of the steel plates and the lateral pressure of the water body inside the cylinder, the spliced steel plates form a self-sealing effect. Then, they are connected into a whole through arc-shaped connecting steel plates and high-strength bolts. The connecting gaskets are designed with the same inner and outer arc degrees as the cylinder wall, rather than the traditional flat gaskets. In this way, when the bolts are tightened, the cylinder is radially stressed instead of being stressed on the plane, which can cause the wall plate to deform and increase the risk of leakage.

[0055] Using a three-dimensional swirl tube and a spiral cone design (the cone angle of the spiral cone is between 20° and 30°), the raw water passes through the three-dimensional inlet pipe to generate a tangential force on the water flow, causing the water body to rotate upward along the spiral cone. Under the action of centrifugal force, the flocculent particles in the water gather towards the wall of the spiral cone. At the same time, they are also affected by the shearing action of gravity, making the aggregated flocs denser and approximately circular in volume. The particles flow out along the inner wall of the cylinder. Due to the increased density of the flocs, the approximate circular sedimentation speed is faster, and the treatment capacity is larger. At the same time, the tangential force is provided by the pressure of the raw water without the need for additional power. The clarification efficiency is high and the effect is good.

[0056] An inclined tube sedimentation area is further set inside the modular micro-vortex clarifier to enable the suspended matter mixed in the supernatant to settle faster, quickly enter the bottom of the cone along the inclined tube section, and the clarification effect is better. The turbidity of the clear water is less than 10 NTU.

[0057] The clarified water enters the existing D-type filter produced by Tsinghua University and Xinjiang De'an Environmental Protection Co., Ltd. The D-type filter is filled with filter media (forming a filter media layer) (i.e., a butterfly-shaped high-efficiency self-adjusting plastic fiber mixed filter body - ZL201010211718.7 or other filter media), and its filtration speed reaches more than 18m 3 / h, which is 2-4 times the filtration speed of conventional filter media. The backwashing water volume is smaller, the turbidity of the treated effluent is less than 1 NTU, the process flow is shorter, and a modular assembled water purification treatment device is formed by combining the modular micro-vortex clarifier and the D-type filter.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular prefabricated water purification device, including a modular micro-vortex clarification device, Characterized in that: The modular micro-vortex clarification device includes a spliced cylinder body, which is mainly assembled and spliced by spliced wall plates, vertical rubber sealing strips, circumferential rubber sealing rings, vertical arc-shaped connecting plates, circumferential arc-shaped connecting plates, spliced wall plate connection holes, outer arc-shaped gaskets, inner arc-shaped gaskets, and connecting bolts. Z-shaped notches are provided on all four sides of the spliced wall plates. Vertical rubber sealing strips and circumferential rubber sealing rings are arranged between the spliced wall plates. The vertical rubber sealing strips are arranged in the Z-shaped notches on the left and right sides of the spliced wall plates, and the circumferential rubber sealing rings are arranged in the Z-shaped notches on the upper and lower sides of the spliced wall plates. An inner arc-shaped gasket is arranged on one side of the circumferential rubber sealing ring, and an outer arc-shaped gasket is arranged on the other side of the circumferential rubber sealing ring. A number of vertical arc-shaped connecting plates and circumferential arc-shaped connecting plates are arranged in the spliced cylinder body. A number of spliced wall plate connection holes are provided on the vertical arc-shaped connecting plates, circumferential arc-shaped connecting plates, and spliced wall plates. Connecting bolts are sleeved in the spliced wall plate connection holes, and the connecting bolts are threadedly connected to the spliced wall plate connection holes. The bottom of the spliced cylinder body is fixedly connected to a bottom conical cylinder body. A number of spliced channel steels are arranged in the spliced cylinder body. A number of spliced wall plate connection holes are provided on the spliced channel steels. The spliced wall plate connection holes are threadedly connected to the connecting bolts. The spliced channel steels are connected to the spliced cylinder body through the connecting bolts. A swirl cone body is arranged in the spliced wall plate. The swirl cone body is a hollow cylinder in an inverted conical shape. An inclined tube support frame is sleeved outside the swirl cone body. The inclined tube support frame is fixedly connected to the spliced channel steel. A number of inclined tubes are arranged on the surface of the inclined tube support frame. An inner cylinder body is sleeved outside the swirl cone body. The inner cylinder body is arranged above the inclined tube support frame. The top end of the inner cylinder body is fixedly connected to an upper cylinder support. The upper cylinder support is fixedly connected to the spliced channel steel. The bottom of the swirl cone body is fixedly connected to a three-dimensional swirl tube. The bottom end of the three-dimensional swirl tube is connected to a water inlet pipe through a flange. One end of the water inlet pipe penetrates through the bottom of the bottom conical cylinder body and is arranged outside the bottom conical cylinder body. A sewage discharge pipe is fixedly connected to the bottom of the bottom conical cylinder body. The sewage discharge pipe is communicated with the inner cavity of the spliced cylinder body. A clarified water outlet is fixedly connected to one side of the spliced cylinder body. The clarified water outlet is communicated with the inner cavity of the spliced cylinder body. A connecting pipeline is fixedly connected to the clarified water outlet. One end of the connecting pipeline is fixedly connected to a D-type filter tank equipped with a filter body of a butterfly-shaped highly efficient self-adjusting plastic fiber mixture.

2. A modular prefabricated water purification device according to claim 1, Characterized in that: A number of support legs are fixedly connected to the surface of the bottom conical cylinder body.

3. An application method of a modular prefabricated water purification device as claimed in claim 1, Characterized in that: Step 1: Reagent preparation. Prepare PAC solution with a concentration of 10% and PAM solution with a concentration of 0.1%. The PAC needs to be mixed and stirred for 30 minutes before use. Since the dissolution ability of PAM is limited, it needs to be stirred for 60 minutes before use, and stirred for 2 minutes every 30 minutes to prevent uneven reagent concentration. Step 2: Raw water dosing. Dose the raw water to be treated with reagents through a diaphragm pump. The turbidity of the raw water is between 900 NTU and 1100 NTU. The dosing amount of the flocculant PAC is 20 mg / L - 30 mg / L, and the dosing amount of the coagulant aid PAM is 0.2 mg / L - 0.3 mg / L. Step 3: After the raw water and the reagents are fully mixed, they are sent into the modular micro-vortex clarification device in the modular prefabricated water purification device through a pump via the inlet pipe. Step 4: Flocculation of suspended solids. The influent passes through the three-dimensional swirl tube of the modular micro-vortex clarification device to change the random growth mode of flocs. Due to the three-dimensional spiral guiding the water flow, the water flow forms an upward swirl and rotates upward along the cone. The flocs are affected by the centrifugal force F = mv 2 / r. The particles spiral upward along the cylinder wall, and the influent overflows along the center of the cylinder body. At the same time, the particles are also affected by the shear force formed by the gravity, and the concentration of suspended particles on the cylinder wall rises rapidly, accelerating the collision and shear of loose flocs to form spherical and dense flocs; Step 5: Solid-liquid separation. The spherical and dense flocs overflow from the upper barrel wall opening of the cyclone cone in the modular micro-vortex clarification device, settle quickly, and fall into the bottom area. There are still some remaining fine particles in the clear water overflowing from the center of the cone. When the water flowing along the lower edge of the inner cylinder into the upper clarification area passes through the inclined tube, the remaining fine particles are adsorbed on the surface of the inclined tube. As the adsorption amount increases, the remaining fine particles fall off to form sludge and directly slide into the bottom area from the diversion ditch. Sludge discharge is carried out once every 6 hours of operation, and the sludge discharge time is 45 seconds. Step 6: Clear water collection. The clear water after solid-liquid separation rises to the clear water collection area. The effluent turbidity can be effectively controlled below 10 NTU. It enters the D-type filter equipped with a filter body of a butterfly-shaped highly efficient self-adjusting plastic fiber mixed filter material through the clear water outlet via the connecting pipeline. Step 7: Clear water effluent. The clear water enters the D-type filter equipped with a filter body of a butterfly-shaped highly efficient self-adjusting plastic fiber mixed filter material. The effluent turbidity is between 0.4 NTU and 0.6 NTU, meeting the requirements of the effluent turbidity in the "Sanitary Standard for Drinking Water". The effluent is drained to the clear water tank through the outlet pipe.

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